#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main() {
    char ch;
     while ((ch = getchar()) != EOF) {
         if (ch != '\n') {
             if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122)) {
                 printf("%c is an alphabet.\n", ch);
             }
             else {
                 printf("%c is not an alphabet.\n", ch);
             }
         }
    }
    return 0;
}
